How do I argue against Sola Scriptura?

I am having a tough time finding a passage from Paul to, I think, Timmothy, stating that the oral history (traditions) are equally important in teaching about Jesus as are the recollections of Jesus’ teachings. Essentially a strong reason to rebut sola scriptura.
Can you direct me to the passage so I can work on converting a friend?

These links should give you the answers that you need. If you have any further questions or concerns that are not answered by this, please contact Catholic Answers directly.
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